Abstract: The asymmetric unit of the title compound, C20H24N2O4·H2O, contains one half-organic molecule (an inversion centre generates the other half of the molecule) and a half-molecule of water (the O atom has site symmetry 2). The near planarity of the fused-benzene ring is illustrated by the very small deviations of all the atoms from the plane [largest deviation = 0.0092 (11) Å. The six-membered N,O-containing ring adopts a half-chair conformation. The observed N-CH2 and CH2-O bond lengths can be correlated to the manifestation of an anomeric effect in the N-CH2-O unit. In the crystal, the molecules are connected into zigzag chains parallel to [001] through O-HN hydrogen bonds formed between the oxazinic N atom and the solvent water molecule. The chains are consolidated by C-HO interactions.

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